Major phone problem

I just noticed my phone running the boot animation while it was sitting on my desk, which is weird because I had the phone on. Now, its doing a few odd things, it seems to have wiped some of my settings, like it erased swype, it is no longer displaying the lock screen when I hit the power button, and the home and search keys aren't working. Also, when I hold the power button, only "turn off phone" comes up, none of the other options. Lastly, some app settings stopped working, like certain settings in Handcent. My phone isn't rooted, so what could have done this?

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